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 <head>
  <title>Dynamic handling of :empty</title>
  <style type="text/css">
   #test1 { background: red; display: block; padding: 1em; margin: 1em; }
   #test1:empty { background: lime; }
   #test2 { background: lime; display: block; padding: 1em; margin: 1em; }
   #test2:empty { background: red; }
</style>
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  <script type="text/javascript">
   

    function test() {
      document.getElementById('test1').appendChild(document.createTextNode(''));
      document.getElementById('test2').appendChild(document.createTextNode(' '));
    }

    window.setTimeout("test()", 100);
   
  </script>

  <p> The following two bars should be green. </p>

  <div id="test1"></div>
  <div id="test2"></div>

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